Toyota 13502-21020 CAMSHAFT

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Camshafts must always be carefully examined before their installation and, before camshaft removal, the camshaft end play must be measured. First, interrupted the connection between the cable and the minus terminal of the 12-volt battery; recall to initialize the system when reconnecting the cable. Take off the valve cover and position the engine with TDC number 1 cylinder with TIMING mark on crank pulley to 'O' mark on TIMING chain cover and Camshaft sprocket marks on colored links of chain. On 2009 and the earlier models, if the camshaft sprockets are removed, the timing chain tensioner will pull the chain tighter and to reposition and lock the tensioner the timing cover ought to be removed. Occasionally, individual auto parts stores can provide that special tool in making the timing chain stay putting while during the sprocket removing, the front cover is not to be removed. With a wrench on the camshaft lugs, undo the camshaft sprocket bolts while at the same time making sure the sprockets do not turn. The camshaft sprocket retaining bolts are next to be run off, the timing chain should be released, and finally the sprockets with the intake or exhaust mark indicated as well. Suspend the timing chain from another projection so it cannot drop into the engine and insert a piece of cloth into the hole in the timing chain cover. Cross check the markings on the camshaft bearing caps and using compatible sequence loosen each cap and remove the caps together with the camshaft(s) from the cylinder head and do ensure that each and every camshaft is replaced in its rightful position. Lifters should be removed in sequence: after this the situation of the camshafts and their corresponding lifters should be examined for wear, while the sprockets and chains ought to be examined for potential harm. For the vehicles produced from 2010 and beyond, when extracting slack in timing chain remove the timing chain tensioner assembly while engaging the wire or zip-tie. When removing the sprockets and disconnecting the chain, one has to apply pressure and keep those camshafts from beginning to rotate. Turning the sequence around, apply the same force to the camshaft cap bolts and then remove the caps only to finally remove the camshafts. Before removal, the camshaft end play should be measured using a dial gauge while the surfaces of the bearings should be checked for wear. With the help of micrometers, measure the OD of each camshaft bearing journal and the ID of each corresponding bearing and record the clearances to a reference specification. Camshaft lobe height should be measured and should also be checked for run out with the help of the dial indicator. Check all the lifter for sign of scuffing and check the diameter of the lifter against the bore. Before camshafts assembly lubricate the camshaft lobes and journal to reduce friction and to put the camshafts in correct orientation. Retorque the bearing cap bolts in a proper sequence and for the models prior to 2009, tighten the bolts in a particular manner. Below are some tips when it coming to the camshaft dowels and sealing surfaces: for the 2010 and later models make sure that the camshaft dowels are correctly oriented and before applying RTV silicone sealant the sealing surfaces should be clean. Place back the camshaft sprockets with the timing chain, and verify valve conformity for 2009 and earlier versions by utilizing the feeler gauges, and record any of the measurements which exceed the distinctive standard. If changes are required, then the camshaft(s) to be over the modified lifter should be removed, measure the thickness of the lifters, and then add up the thicknesses of the new lifters required to be purchased. Choose the right thickness for the lifters, and lubricate before fitting them; the last step is rechecking the valve clearances.